One poor tone, with volume adjusting ringer and handset. After a test, the sound is okay, no problem-it seems.
After connecting the phone but forgot to put the batteries, the phone had a dial tone, and pressing a button meant, suggesting that it works without batteries, and the batteries used as for the digital display.
The menu is a bit special, must confirm with the menu button (as for example the directory is validated with the mods directory button, etc.), cancellations taking place with another button, which is not usual, but once you know, no pb.